feat(workspace): initialize Rust workspace structure for v2

Set up Cargo workspace with initial crates:
- cli: main application entry point with chat streaming tests
- config: configuration management
- llm/ollama: Ollama client integration with NDJSON support

Includes .gitignore for Rust and JetBrains IDEs.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

crates/cli/.gitignore

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+/target
+### Rust template
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+### rust-analyzer template
+# Can be generated by other build systems other than cargo (ex: bazelbuild/rust_rules)
+rust-project.json
+
+

crates/cli/Cargo.toml

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+[package]
+name = "code"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+clap = { version = "4.5", features = ["derive"] }
+tokio = { version = "1.39", features = ["macros", "rt-multi-thread"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+color-eyre = "0.6"
+llm-ollama = { path = "../llm/ollama" }
+config-agent = { package = "config-agent", path = "../config" }
+futures-util = "0.3.31"
+
+[dev-dependencies]
+assert_cmd = "2.0"
+predicates = "3.1"
+httpmock = "0.7"
+tokio = { version = "1.39", features = ["macros", "rt-multi-thread"] }

crates/cli/src/main.rs

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+use clap::Parser;
+use color_eyre::eyre::Result;
+use config_agent::load_settings;
+use futures_util::TryStreamExt;
+use llm_ollama::{OllamaClient, OllamaOptions, types::ChatMessage};
+use std::io::{self, Write};
+
+#[derive(Parser, Debug)]
+#[command(name = "code", version, about = "Rust code-agent (Ollama)")]
+struct Args {
+    /// Override Ollama base URL (local or cloud)
+    #[arg(long)]
+    ollama_url: Option<String>,
+
+    /// Model name
+    #[arg(long)]
+    model: Option<String>,
+
+    /// Print response only (headless-like)
+    #[arg(long)]
+    print: bool,
+
+    /// Prompt to send
+    #[arg()]
+    prompt: Vec<String>,
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    color_eyre::install()?;
+    let args = Args::parse();
+
+    let prompt = if args.prompt.is_empty() {
+        "Say hello".to_string()
+    } else {
+        args.prompt.join(" ")
+    };
+
+    let settings = load_settings(None).unwrap_or_default();
+    let base_url = args.ollama_url.unwrap_or(settings.ollama_url);
+    let model = args.model.unwrap_or(settings.model);
+
+    let client = OllamaClient::new(base_url);
+    let opts = OllamaOptions {
+        model,
+        stream: true,
+    };
+
+    let msgs = vec![ChatMessage {
+        role: "user".into(),
+        content: prompt,
+    }];
+
+    let mut stream = client.chat_stream(&msgs, &opts).await?;
+    while let Ok(Some(chunk)) = stream.try_next().await {
+        if let Some(m) = chunk.message {
+            if let Some(c) = m.content {
+                print!("{c}");
+                io::stdout().flush()?;
+            }
+        }
+        if matches!(chunk.done, Some(true)) {
+            break;
+        }
+    }
+    Ok(())
+}

crates/cli/tests/chat_stream.rs

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+use assert_cmd::Command;
+use httpmock::prelude::*;
+use predicates::prelude::PredicateBooleanExt;
+
+#[tokio::test]
+async fn headless_streams_ndjson() {
+    let server = MockServer::start_async().await;
+    // Mock /api/chat with NDJSON lines
+    let body = serde_json::json!({
+        "model": "qwen2.5",
+        "messages": [{"role": "user", "content": "hello"}],
+        "stream": true
+    });
+
+    let response = concat!(
+        r#"{"message":{"role":"assistant","content":"Hel"}}"#,"\n",
+        r#"{"message":{"role":"assistant","content":"lo"}}"#,"\n",
+        r#"{"done":true}"#,"\n",
+    );
+
+    let _m = server.mock(|when, then| {
+        when.method(POST)
+            .path("/api/chat")
+            .json_body(body.clone());
+        then.status(200)
+            .header("content-type", "application/x-ndjson")
+            .body(response);
+    });
+
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("code"));
+    cmd.arg("--ollama-url").arg(server.base_url())
+        .arg("--model").arg("qwen2.5")
+        .arg("--print")
+        .arg("hello");
+
+    cmd.assert()
+        .success()
+        .stdout(predicates::str::contains("Hello").count(1).or(predicates::str::contains("Hel").and(predicates::str::contains("lo"))));
+}